How Reactions Happen: Steps, Collisions, & Energy - AP Chem Unit 5, Topics 4, 5, and 6

[@sumuuu532]

I love your videos so much, I currently don't have a teach for AP Chem, she had to go on a maternity leave and you'vr been helping me so much. I've recommended your videos to all my classmates.

[@JeremyKrug]

I really appreciate your kind words and support! Best wishes to everyone in your class as your work through AP Chem, and I hope your teacher makes it back healthy from maternity leave.

[@emmanuellaeledu]

Your videos are super helpul, Mr. Krug!

[@JeremyKrug]

So glad you like them!

[@bonelessburst2227]

If catalyzed pathways lower the activation energy, does that result in a lower/higher change in enthalpy as well depending on whether its endo/exothermic?

[@JeremyKrug]

Excellent question. No they do not. Since the energy of reactants and energy of products do not change when a catalyst is added, it means the difference between those two levels does not change. Since the energy 'peak' at the activated complex is lower, it just means that your activation energy is lower. Thanks for watching!

[@bonelessburst2227]

@@JeremyKrug Youre saving my grade rn. Thank you!

[@NatashaFernando-un2uw]

at 1:13 how do you know what the rate is if you do not know the order?

[@JeremyKrug]

We can infer the order of an elementary step from its stoichiometry. Each step has its own 'mini' rate law. The rate law of the slow step happens to be the rate law for the whole reaction.

[@nadhri]

Thanks for saving my grade 😭🙏

[@JeremyKrug]

You're very welcome. You've got this!

[@corbinbiology]

does the energy profile tell us anything about the rate of reaction? For example if we have a exergonic energy profile. And lets say we have a curve with a high Ea, and a curve with a low Ea, does it tell us anything about the rate of reaction?

[@JeremyKrug]

Yes. Generally speaking, the higher the Ea the slower the reaction. Excellent question!